well, there are a number of things you can do (as Kai mentioned), many of which are good... but cost and simplicity also factors in. If you wan't that good torque, the LS crank is the key ingredient.

The easiest way is to just take an LS block (with crank and rods) and throw some better pistons on there (b16a, b18c, b16b, pretty much any vtec piston will work, its just a matter of how high you're willing to to with your compression ratio). The weak-point in this setup is the rods... they wont be able to rev very high reliably to make good use of that b16 head). In order to make LS rods rev reliably to ~8k+, you'll need to get them shot-peened and use better rod bolts than OEM.

A better way, is to put those same internals (pistons, rods, crank) into a b18c block. The main advantage here (as Kai also earlier pointed out) is that you get oil squirters, a block girdle, and OEM oil passages to activate vtec (none of that crazy oil-line business, no messing with copper plugs, etc). It will perform the same as the above setup, but be more reliable.

Those are your main options using OEM parts (although both have a variety of tweaks possible via piston choice). You can also have your crank balanced and lightened if you plan on having a relatively high redline (or just hanging out at redline much, which isn't a great idea). Beyond that, there are forged pistons and rods... those get kinda pricey and might exceed your budget or goals. I would reccomend using ARP rod bolts and head studs no matter what you do.